Drought Periods Assessment in Eastern Georgia Using SPI-3 Index in 1936-2023

Amiranashvili, A.; Davitashvili, T.; Kharshiladze, O.; Samkharadze, I.; Amilakhvari, D.

Please use this identifier to cite or link to this item: http://openlibrary.ge/handle/123456789/10767

Title:	Drought Periods Assessment in Eastern Georgia Using SPI-3 Index in 1936-2023
Authors:	M. Nodia Institute of Geophysics of I. Javakhishvili Tbilisi State University, Tbilisi, Georgia Ilia Vekua Institute of Applied Mathematics of Ivane Javakhishvili Tbilisi State University, Tbilisi, Georgia Institute of Hydrometeorology of Georgian Technical University, Tbilisi, Georgia Amiranashvili, A. Davitashvili, T. Kharshiladze, O. Samkharadze, I. Amilakhvari, D.
Keywords:	Modern problems in Geophysics;Proceedings;SPI;atmospheric precipitation;drought categories;drought risk;climate change
Issue Date:	2025
Citation:	1st International Scientific Conference “Modern problems in Geophysics”. Proceedings, ISBN 978-9941-36-434-1, ISSN 3088-4349, Tbilisi, Georgia, November 6-8, 2025. Publish House of Iv. Javakhishvili Tbilisi State University, Tbilisi, 2025, pp. 121-124.
Abstract:	In the work detailed statistical analysis of the duration of drought periods D (months) normalized per decade for four SPI-3 categories (agriculture drought; SPI ≤ -1.0, ≤ -1.5, ≤ -2.0 and ≤ -2.5) in Eastern Georgia based on observations at 18 meteorological stations during 1936-2023 is presented. The statistical characteristics of D values in 1936-2023, 1936-1975, and 1984-2023 were compared. The variability of D values in 1984-2023 compared to 1936-1975 (ΔD) was assessed. In particular, it was found that ΔD values are different at different points. On average, for eastern Georgia, ΔD values for all SPI categories, except ≤ -2.5, are increasing (i.e., an increase in the duration of droughts is observed).
URI:	http://openlibrary.ge/handle/123456789/10767
Appears in Collections:	1st International Scientific Conference “Modern problems in Geophysics”. Proceedings, Tbilisi, Georgia, November 6-8, 2025

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